Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    function Hi(x) {
      this.x = x;
    }
    Hi.prototype.add = function(y) {
      return this.x + y
    }
    
    var hiClosure = function(x) {
        return {
          x: x,
          add: function(y) {
            return this.x + y
          }
        }
        }
        
        
        
    var hi = new Hi(4);
    var hi2 = hiClosure(4);
  };
</script>

Test runner

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hi.add(4);

hi2.add(4);

var hi = new Hi(4);
hi.add(4);

var hi2 = hiClosure(4);
hi2.add(4);

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